Okay so if i hook up the tube to my aftermarket deck with the rca cables the red and the blue/white wires of the FAST-9999 still have to be connected to something? Where do i hook them up?

The red wire of the FAST-9999 will connect to the +12v constant on the headunit and the blue/white wire will connect to the +12v switched (key-on/key-off) or the amplifier remote of the headunit. Consult the owner's manual of your headunit to correctly identify these wires.